fume 4, cache writing slowdown

[finalightvfx]

i think i've found something. when the scene is saved to the default windows user path (C:\Users\'user'\Documents\3dsMax\scenes) it sims quickly like before when the max session is unsaved, however when i save the scene to my own generated file path for projects, it sims very slowly.

this was reproducable in both 3dsmax2012 and 2015.

any thoughts on to why the sim speed is related to the 3dsmax scene file saved path? thanks!